View source for 640s

===Sources===
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* {{cite web |last=Bede |author-link=Bede |title=Book III |work=[[Ecclesiastical History of the English People]] |publisher=Internet History Sourcebooks Project |url=http://www.fordham.edu/halsall/basis/bede-book3.html |ref={{harvid|Bede Book&nbsp;III}}}}
* {{cite book |last=Graff |first=David |date=2002 |pages=197–198 |title=Medieval Chinese Warfare 300–900 |location=London |publisher=Routledge |isbn=0-415-23955-9 |url=https://books.google.com/books?id=gpmBAgAAQBAJ&pg=PA197|access-date=2016-11-03}}
* {{cite book |last=Kirby |first=D. P. |date=2000 |title=The Earliest English Kings |edition=revised |publisher=Routledge |isbn=0-415-24211-8}}
* {{cite book |last=Muir |first=William |author-link=William Muir |date=1898 |title=The Caliphate: Its Rise, Decline, and Fall, from Original Sources |edition=3rd |location=London |publisher=Smith, Elder}}
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[[Category:640s| ]]